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Surface pinking in titanium dioxide/lead stabiliser filled PVC profiles

机译：二氧化钛/铅稳定剂填充的PVC型材表面发红

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摘要

The "pinking" phenomenon which is known to occur in white PVC profiles has been investigated in detail in terms of test evaluations and analysis methods for determining the mechanism and nature of the species responsible. An artificial weathering test method using a Microscal unit with submersion of samples in water was established where colour measurements and FTIR analysis proved the similarity of functional groups present to those in naturally pinked samples. Analysis of the artificially pinked samples using hydroperoxide concentration analysis, fluorescence spectroscopy, microscopic FTIR and scanning electron microscopy showed that artificially pinked samples presented a more extended degree of degradation than samples that remained white during the exposure in the Microscal Unit. Short chain conjugated polyenes were also identified as the most likely functional groups responsible for the development of the pink colour and interactions between the titania pigment and the lead stabilisers would seem to have an influence in the pinking development. In addition, it was found that there was an increase in production of hydroperoxy radicals at the onset of colour development. Addition of trace lead dioxide accelerated the production of pinking. Different titanium dioxide grades used in the PVC profiles showed differences in pinking in the artificial test, also an increase in the titanium dioxide concentration decreased the formation of the pinking colouration in artificial conditions The use of different analysis methods (Microwave Dielectric Spectroscopy and ESR) showed differences in carrier radical production and carrier radical trapping between the pigments used suggesting that a small difference in the coatings could play an important part in the pinking phenomenon. Finally, a mechanism was proposed involving a redox reaction between the titanium dioxide and the lead stabiliser that could facilitate the production of short polyene chains in the PVC matrix producing the pink colouration.
机译：已经通过测试评估和确定负责的物种的机理和性质的分析方法详细研究了已知在白色PVC轮廓中发生的“钉扎”现象。建立了一种使用Microscal单元将样品浸入水中的人工耐候性测试方法，其中颜色测量和FTIR分析证明存在的官能团与天然粉红色样品中的官能团相似。使用氢过氧化物浓度分析，荧光光谱，显微FTIR和扫描电子显微镜对人造粉红色样品进行的分析表明，与在Microscal Unit中曝光期间保持白色的样品相比，人造粉红色样品的降解程度更高。短链共轭多烯也被认为是最可能引起粉红色发色的官能团，二氧化钛颜料与铅稳定剂之间的相互作用似乎对粉红色发色有影响。另外，发现在显色开始时氢过氧自由基的产生增加。添加痕量二氧化铅加速了粉红色的产生。 PVC型材中使用的不同等级的二氧化钛在人工试验中显示出粉红色的差异，二氧化钛浓度的增加也降低了在人工条件下产生的粉红色化的颜色。所用颜料之间在载体自由基产生和载体自由基捕获方面的差异表明涂料中的细微差异可能在粉红色现象中起重要作用。最后，提出了一种机制，该机制涉及二氧化钛和铅稳定剂之间的氧化还原反应，该反应可以促进在PVC基质中产生多粉红色的短多烯链的产生。

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  • 来源
    《Polymer Degradation and Stability》 |2010年第10期|p.2022-2040|共19页
  • 作者

    Michele Edge; rnChristopher M. Liauw; rnNorman S. Allen; rnRakel Herrero;

  • 作者单位

    Dalton Research Institute, Faculty of Science and Engineering, Manchester Metropolitan University, Chester Street, Manchester M1 5GD, UK;

    rnDalton Research Institute, Faculty of Science and Engineering, Manchester Metropolitan University, Chester Street, Manchester M1 5GD, UK;

    rnDalton Research Institute, Faculty of Science and Engineering, Manchester Metropolitan University, Chester Street, Manchester M1 5GD, UK;

    rnDalton Research Institute, Faculty of Science and Engineering, Manchester Metropolitan University, Chester Street, Manchester M1 5GD, UK;

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  • 正文语种 eng
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  • 关键词

    poly(vinyl chloride); titanium dioxide; lead stabiliser; pinking; weathering; UV light;

    机译：聚氯乙烯二氧化钛;铅稳定剂泛红风化;紫外线;

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